Monitoring Reports

During periods of drought, the Cooperative Water Supply Operations on the Potomac (CO-OP) helps manage the Washington metropolitan area water supply system by coordinating withdrawals from the Potomac River and off-river reservoirs and recommending releases from upstream reservoirs when forecasted flow in the river is not sufficient to meet expected needs. These needs include water demands and an environmental flow-by of 100 million gallons per day (MGD) on the Potomac River at Little Falls dam near Washington, D.C.

Daily Potomac flow and demand update (Wednesday, 2023-10-18)

Submitted by admin1 on Wed, 10/18/2023 - 12:13

Situational Awareness (Wednesday, 2023-10-18)
Potomac River flows at Point of Rocks are currently above 2000 cfs, the threshold for CO-OP daily drought monitoring, due to the past weekend’s rain. But flows are expected to begin falling again over the next couple of days. A small amount of rainfall, approximately 0.3 inches, is expected in the basin over the next week according to National Weather Service forecasts.

Recent basin-wide average precipitation (above Little Falls):

Daily Potomac flow and demand update (Tuesday, 2023-10-17)

Submitted by admin1 on Tue, 10/17/2023 - 13:08

Situational Awareness (Tuesday, 2023-10-17)
Potomac River flows are rising due to this past weekend’s rainfall, but flows at Point of Rocks are not expected to rise above the 2000 cfs drought monitoring threshold for any extended period of time. According to Middle Atlantic River Forecast Center predictions, only approximately ¼ inch of rain is expected in the basin over the next 7 days.

Recent basin-wide average precipitation (above Little Falls):

Daily Potomac flow and demand update (Thursday, 2023-10-12)

Submitted by admin1 on Thu, 10/12/2023 - 12:46

Situational Awareness (Thursday, 2023-10-12)
Potomac River flows are again slowly declining. Total Washington metropolitan area withdrawals are now lower due to the arrival of autumn weather. According to Middle Atlantic River Forecast Center forecasts, up to an inch of rain is expected in the basin over the next three days.

Recent basin-wide average precipitation (above Little Falls):

Daily Potomac flow and demand update (Monday, 2023-10-09)

Submitted by admin1 on Mon, 10/09/2023 - 12:50

Situational Awareness (Monday, 2023-10-09)
The Potomac River watershed above Little Falls received about a ½ inch of rain during the past three days, and as a result river flows have increased slightly. The precipitation outlook for the next seven days is promising – about an inch of rain is expected.

Recent basin-wide average precipitation (above Little Falls):

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